SpringBoot HATEOAS用法简介(入门)

<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-hateoas</artifactId>
</dependency>

<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-data-jpa</artifactId>
 </dependency>
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-hateoas</artifactId>
 </dependency>
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-web</artifactId>
 </dependency>
 <dependency>
 <groupId>com.alibaba</groupId>
 <artifactId>druid</artifactId>
 <version>1.0.25</version>
 </dependency>
 <dependency>
 <groupId>mysql</groupId>
 <artifactId>mysql-connector-java</artifactId>
 <version>5.1.40</version>
 </dependency>

 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-test</artifactId>
 <scope>test</scope>
 <exclusions>
 <exclusion>
  <groupId>org.junit.vintage</groupId>
  <artifactId>junit-vintage-engine</artifactId>
 </exclusion>
 </exclusions>
 </dependency>

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import org.springframework.hateoas.ResourceSupport;

import javax.persistence.*;
import java.io.Serializable;
@Entity
@Table(name="sys_user")
public class SysUserInfo extends ResourceSupport implements Serializable{

 @Id
 @GeneratedValue
 private Long userId;
 @Column(unique=true,length=20,nullable=false)
 private String username;
 @Column(length=2,nullable=true)
 private String sex;
 @Column(length=10,nullable=true)
 private String password;

 public SysUserInfo(){

 }

 @JsonCreator
 public SysUserInfo(@JsonProperty("userId")Long userId,@JsonProperty("username")String username,
      @JsonProperty("sex")String sex,@JsonProperty("password")String password){
  this.userId = userId;
  this.username = username;
  this.sex = sex;
  this.password = password;
 }
}
....

@GetMapping("/findBySysUserId/{userId}")
 public SysUserInfo findBySysUserId(@PathVariable("userId") long userId) {
  if (LOG.isInfoEnabled()) {
   LOG.info("请求参数userId : {}" , userId);
  }
  Optional<SysUserInfo> sysUserInfo = Optional.ofNullable(sysUserRepository.findByUserId(userId));
  if (!sysUserInfo.isPresent()) {
   throw new NotFoundException("查询不到用户信息! userId:"+userId);
  }
  //Resource<SysUserInfo> resource = new Resource<SysUserInfo>(sysUserInfo.get());
  ControllerLinkBuilder linkBuilder = linkTo(methodOn(this.getClass()).findBySysUserId(userId));
  sysUserInfo.get().add(linkBuilder.withRel("findBySysUserId"));
  return sysUserInfo.get();
 }